import { Table } from '../interface';
import { reactive, computed, toRefs } from 'vue';

/**
 * @description table 页面操作方法封装
 * @param {Function} api 获取表格数据 api 方法 (必传)
 * @param {Object} initParam 获取数据初始化参数 (非必传，默认为{})
 * @param {Boolean} isPageable 是否有分页 (非必传，默认为true)
 * @param {Function} dataCallBack 对后台返回的数据进行处理的方法 (非必传)
 * @param {Function} changeSearchParams 对查询前参数进行修改 (非必传)
 *
 * */
export const useTable = (
  api?: (params: any) => Promise<any>,
  initParam: object = {},
  isPageable: boolean = true,
  dataCallBack?: (data: any) => any,
  requestError?: (error: any) => void,
  changeSearchParams?: (data: any) => {}
) => {
  const state = reactive<Table.StateProps>({
    // 表格数据
    tableData: [],
    loading: false,
    // 分页数据
    pageable: {
      // 当前页数
      pageNum: 1,
      // 每页显示条数
      pageSize: 50,
      // 总条数
      total: 0
    },
    // 查询参数(只包括查询)
    searchParam: {},
    // 初始化默认的查询参数
    searchInitParam: {},
    // 总参数(包含分页和查询参数)
    totalParam: {}
  });

  /**
   * @description 分页查询参数(只包括分页和表格字段排序,其他排序方式可自行配置)
   * */
  const pageParam = computed({
    get: () => {
      return {
        pageNum: state.pageable.pageNum,
        pageSize: state.pageable.pageSize
      };
    },
    set: (newVal: any) => {
      console.log('我是分页更新之后的值', newVal);
    }
  });

  /**
   * @description 获取表格数据
   * @return void
   * */
  const getTableList = async (newApi?: Function) => {
    const useNewApi = typeof newApi === 'function';
    if (!api && !useNewApi) return;
    let _api = useNewApi ? newApi : api;

    try {
      // 先把初始化参数和分页参数放到总参数里面
      Object.assign(state.totalParam, initParam, isPageable ? pageParam.value : {});
      state.loading = true;

      let params = { ...state.totalParam };
      if (changeSearchParams) {
        params = await changeSearchParams(params);
        if (!params) {
          state.loading = false;
          return;
        }
      }

      let data = await _api(params);

      dataCallBack && (data = dataCallBack(data));

      state.tableData = (isPageable ? data?.records : data) ?? [];

      // 解构后台返回的分页数据 (如果有分页更新分页信息)
      if (isPageable) {
        const { total, size, current } = data;

        let pageable = {
          pageNum: 1,
          pageSize: 50,
          total: 0
        };
        if (size && total && current) {
          pageable = {
            pageNum: current,
            pageSize: size,
            total
          };
        }
        console.log(data, 'data');

        console.log(pageable, 'pageable');

        updatePageable(pageable);
      }

      state.loading = false;
    } catch (error) {
      console.log(error);
      state.loading = false;
      state.tableData = [];
      requestError && requestError(error);
    }
  };

  /**
   * @description 更新查询参数
   * @return void
   * */
  const updatedTotalParam = () => {
    state.totalParam = {};
    // 处理查询参数，可以给查询参数加自定义前缀操作
    let nowSearchParam: Table.StateProps['searchParam'] = {};
    // 防止手动清空输入框携带参数（这里可以自定义查询参数前缀）
    for (let key in state.searchParam) {
      // 某些情况下参数为 false/0 也应该携带参数
      if (
        state.searchParam[key] ||
        state.searchParam[key] === false ||
        state.searchParam[key] === 0 ||
        state.searchParam[key] == ''
      ) {
        nowSearchParam[key] = state.searchParam[key];
      }
    }
    console.log(state.totalParam, 'state.totalParam');

    Object.assign(state.totalParam, nowSearchParam, isPageable ? pageParam.value : {});
  };

  /**
   * @description 更新分页信息
   * @param {Object} pageable 后台返回的分页数据
   * @return void
   * */
  const updatePageable = (pageable: Table.Pageable) => {
    Object.assign(state.pageable, pageable);
  };

  /**
   * @description 表格数据查询
   * @return void
   * */
  const search = () => {
    state.pageable.pageNum = 1;
    updatedTotalParam();
    getTableList();
  };

  /**
   * @description 表格数据重置
   * @return void
   * */
  const reset = () => {
    state.pageable.pageNum = 1;
    // 重置搜索表单的时，如果有默认搜索参数，则重置默认的搜索参数
    state.searchParam = { ...state.searchInitParam };

    updatedTotalParam();
    getTableList();
  };

  /**
   * @description 每页条数改变
   * @param {Number} val 当前条数
   * @return void
   * */
  const handleSizeChange = (val: number) => {
    state.pageable.pageNum = 1;
    state.pageable.pageSize = val;
    getTableList();
  };

  /**
   * @description 当前页改变
   * @param {Number} val 当前页
   * @return void
   * */
  const handleCurrentChange = (val: number) => {
    state.pageable.pageNum = val;
    getTableList();
  };

  return {
    ...toRefs(state),
    getTableList,
    search,
    reset,
    handleSizeChange,
    handleCurrentChange,
    updatedTotalParam
  };
};
